Machine for milling turbne-buckets.



J. F. LYONS. MACHINE FOR MILLIEG TURBINE BUOKETS.

APPLICATION FIXED JAN.25,1912.

v Patented Dec. 9, 1913.

5 snnmssanm 1.

J. P. LYONS. MACHINE FOR MILLING TURBINE BUCKETS. APPLICATION FILED JAN. 25, 1912.

Patented Dec. 9, 1913.

. 5 SHEETS-SHEET 3.

J. F. LYONS. MACHINE FOR MILLING TURBINE BUOKETS. APPLICATION FILED JAN. 25, 1912.

1 ,081 ,242, Patented Dec. 9, 1913.

5 SHEETS-SHEET 4.

gi -N W 4 41 J.F.LYONS. MACHINE FOR MILLING TURBINE BUGKETS.

APPLICATION FILED JAN. 25, 1912. V 7 1,081,242, I Patented Dec. 9, 1913.

, v 5 SHEETS-SHEET 5.

* STATES PATENT onn cu.

JOHN F.- LYONS, F .HYIDE Pm MASSACHUSETTS; ASSIGNUR' TO .3. FILSTUR TE V'ANT COMPANY, OF BOSTON, MASSACHUSETTS, .ACORPORATIONi OIIIIA-SSACIIUSEEI'TS.-

MACHINE FOB. MILLING TURBINEEPB UCKETS;

for-millingturbine buckets, and more particularly! to machines .for 'millingginclined buckets-in :theasolid metal faces of the. bucket-carrying parts of: an elastic-fluid tur-' bine; such as .a steam turbine.

The buckets of: the type whiehzthe machine of: the present inventionzis armangedto mill are shown in Figures 4 and-51othe patent to \Villiam E. Snow, 1,007 ,249, gra nted Octo-.

' ber 31, 1911,andtinFigsI-A-andi5-of the patent to William Eng Snow, 1,013,080, granted December 26, 1911. As particularly illhstrateddn. the 1 Snow patents, the lips which form thepartitionzwalls between-the buckets have semi-circular.:notches-cutin them. These notches are cut: for the purpose of accommodating the supportingcshaft 0r stud of the. milling cutter which: is .used' to mill the buckets. The milling. cutter used in-milli'ng the'buckets shown inwthe-Snow- Y patents consists .of a circular cutter rigidly carried on-theend ofa supporting stud orshaft upon which cutting teeth. are formed adjacent the cutter so'that when the stud reaches the edge of the partition wall it mills the semicircular notch in the: edge of the partitionwwall soethat the CIIttBIwCfiIl-Slllk itself far enouglrinto the metal to mill out a bucket having. a semicircular periphery or bottom to reverse -the direction of .flow of motive fluid. If the buckets canabe milled so that no notch is cut-inthe edgeof the;- partitions, the partitions will be stronger and will more effectually prevent the leakage of the motive fluid from one bucket to another.;

Withthe object, thereiore, of milling but semici-rcular inclined .turbine buckets 1 in solid'material having theedges of their. partition walls continuous, thepresent inven-:

tion consists in'a milling machine having a milling cutterarranged to mull outa bucket Specification of-Ldtterslatentz Application January 25,1513... Serial .No. 673,366.

'- is held in a supporting Patented Dec.9;-1913.;

cavityg-havingdts bottomzforming. a substantially semiscylindrioal cavity with 1 unbroken end Walls.-.

K Other 'features' of the-invention consist in certain devicegarrangements and combina tions of parts-hereinafter described, the: advantages: of which will. be apparent. to one skilled inuthmart :from the following; de

.scri-ptionz Referringrto the drawings, in which. the preferred embodiment ofthe presentinventlon is-illustrated: Fig. 1 is-:.a front eleiva-' tion of the milling machine showing. half of a twin: machine; F ig; :2 .is' a side. elevation looking -fl'0m. theright; hand side of the ma chine; Fig. 3is=.-a plan-.view-Ishowing the work support and a turbine wheel mounted.

thereon,- and alsoYshowing .in section themillingrcutter' performing the first cutting operation in :formingthe buckets; Fig. 4

1s arvertical section. on the line. 41-4 of Fig;

'3;- Fig.'=5 isanzenlargedsectional view show ing the milling cutter performing the second cutting-operation in forming the'-buckets;-

Fig 6 isea detailview showing the gear connection 5 for drizvingzthemilling cutter;

Fig...:7 a fragmentary view ofthe pe ripheral': face'of. the: turbiriewheel after the buckets are' milled; F ig.-.8--is a section onthe line- S'8-of-' Fig.. 7 and Fig.9 is a section The. buckets are cutby means of a circular" milling-cu-tter l having-flat endfacesQ and?) end-teeth 4 formed on its periphery. The

cutter-has a counter sunk bearing in whichis received a headed stud 6 Whichmformsa si1pporting journal for thecutter and the flat head 8 of whiehis-received in the counter sink in the face2 of: the cutter. The stud 6 sleeve 10 which'is carried on the machine rame. The: end face of the sleeve 10 next the cutter iormsa semi annular bearing';surface -11 againstone end face of the-cutter so that the cutter is held from tilting but is: free to'rotate about the I00 stud 6." The stud-Sis held'in thesleeve 10 by means of-the reduced screw-threaded end 12 .projecting'through the end of the. sleeve; 10 opposite the cutter and receivinga clamping=nut 14. The stud-6 is positioned inthesleeve 10 by means of a slot cut in its side which receives the'pi'n 16 driven through the side ofthe sleeve 10. The head 8 of the stud 6 is flush with the-end face2 of-thecutter to- Ward-the'workso'thatthis face of the cutter is entirely free of all projections. 6' has'its side. next the work cut away (adj acent the other end face 3 of the cutter) to form a substantially V-shaped notch 18 which extends to the center of the stud. One wall 26 of the notch is flush .with the end face 3 of the milling cutter so that this face of the milling cutter free of projections for a complete semi-circular sector next-the work. The otherwall of the notch is cut at an angle so that it is substantially tangential to the works The sleeve. has a notch 24 cut in it which" coincides with the notch 18 so that the milling cutter- 1, the stud'6 and sleeve-10 combined form a V shaped notch adapted to receive the wedge-shaped ortion of the work between the inclined buc et bein g milled and the surface of the work. The

cutter 1 can, there fore, mill a bucket .which is inclined to the surfaceof the work and to the axis of the cutter on the'face 3 of the cutter and beyond the axis'of-the cutter on the face-2 of thefcutter. The teeth 4 of the" milling cutter ,not only form cutting teeth, .but.

also'forin the teeth of a worm gear wheel.

The front edges 26 of the teeth 4 form' the s itting edges of .the milling cutter, while the backs 28 'of'the-teeth 4 form contact surfaces against which bears the thread of the worm 32 whichdrivesthe cutter. The worm 32 is formedon the lower end of a shaft 34 which is supported in bearing sleeves 36 and 38 and-carries a spiral gear on its upper end.

'Thegear 40 .is driven from a spiral gear idler 41 which in turn meshes 1 and is-drivenfrom a spiral gear-42 which'is carried-on the forward end of a shaft 43 which bears a cone pulley 44 belted to a cone pulley 46 on the maindriving shaft 48 of the machine, which by means ofa pulley 49 is beltdriven from a suitable source of, power." The bearing sleeves 36 and 38 are formed on-a plate 50 which is pivoted about the axis of the spiral gear wheel 41 and is arranged to be clamped I in pbsitionby a clamping bolt 52rec'eived through a curved slot. By means of the plate 50, the worm 32can be moved relatively to the cutter 4 sothat cutters of dif-.

5'0 ferent diameters may employed. V. The turbine wheel .u onwhich the milling'machine is illustrate as operating, isa single forging-having a flanged rim 62 in the periphery of which the buckets are to be cut. The: wheel 60 is supported and fed to port indicated generally by reference character 64. The work support 64 comprises a turret 66-, a slide 68 supporting the turret, a- 60 second slide ZO supporting the slide 68 and ir. turn supported upon the bench 72 formed 'on the machine frame. The wheel 60 is held -on the turret 66 by means of a clampingbolt 74 which is received through the hub of the wheel 66 andby clamping bolts 76, the heads 'ofwhich are received in recesses .78 cutin the upper face of the turret and which bear on their upper ends nuts 82 which press the clips 84 against the upper edge of the rim slide 68 by ineansof a downwardly projeqb an annular groove in the slide 68. "Secured by means of screws 88 to the annular flange with a worm 92 by means of which the t'ur-.

a horizontal shaft 94 which bears on its for- 96 is driven through an idler 98-from a gear spring pressed 104 which is arranged-to engage in a recess 106 formed in a 108 on the machine frame. The idler' 98 .is mounted on a. stud-received in a curved slot 110 concentriciwiththe ar 96 so thatgears of different sizes'may used asthe gear wheel 100. A gear wheel-100 is selected of lutions of the handle 102 will turn the turret sent the turbine wheel in position for the bucket.

X The slide 68 is mounted to reciprocate on I the slide in a direction. at right angles to the feed of the work by means of a dove tail 120. The slide 68 is positioned laterally downwardly projecting lugs 134 .on' the slide 70 and meshing with a rack 136 on the ma'' chine frame. The worm;132-is turned to. feed the; work by means of a shaft137 upon end of the: shaft 137 "carries an incased gear wheel 138 which is driven be rotated either by power or by hand .in feeding. the work. The shaft 140 is; are ranged ob P wer driven by means of 'a' double crown wheel 146 which isloosely splinedupon it-and is arranged to e ge .t-wo'crown wheels 148iand 150 loosely ourtively to feed the work' and to .return the wo'rk after the feeding movement. The crown wheel 148 bears a gear 152 which meshes with a gear wheel 154 carried on a the sides of two intersecting grooves in- 62. Theturret is rotatably mountedonthe .ing annular flange 86 which is received in 1' 86 1s a ring 90 in the periphery of which are cut gear teeth which are arrangedto mesh 1 ret 66 is rotated. Theworm 92 is carried onf- 80 Ward end a gearwheel 96.v The gear wheel wheel 100 which 15 provided with a handle v 102. The handle 102 is provided :with a such a size that one or more complete revoforward after each milling operation to pre-' milling cutter to operate to cut the next.

of the line of feed by means of the worm I cated to feed the work to the millingcutter by means of a worm -132held between two which it is loosely 'splined. The forward V g from a worm 139 carried'upon the shaft 140 which is j our- 'naled in lugs v142, 143 and 144 onthe 'ma-' chine frame. The shaft 140 isjarranged to g naled onthe shaft and arranged respec;,

shaft 155 which bears on its rear end the cone pulley '6. The pulley 156 is belt driven from a 'co'ne pulley 158 which is in turn belt driven from' the pulley 44 at the 5 top of the machine. The belts are so arranged that the gear 152 is slowly driven to fee the work slowly to the milling cutter. The crown wheel 1-50 bears a pulley face 170 which is arranged to be belted directly 1 to a large ulley wheel 172 on the main driving shaiit so that it'i s rapidly driven to quickly return the work after the milling operation. r The shaft 140 is arranged to be manually turned to feed the work by means of a crown wheel 180 loosely splined on the shaft and "arranged to' engage. a. second crow-n wheel 182 which fits over the end of the shaft 140 and is rotatably mounted in 2b the lug 184 on "the machine frame. The crown wheel 182 is arranged to be turned by means of the bevel. gear wheel 186 meshing.

with a bevel gear 188 on the crown wheel, the shaft 190,- the bevel gears 192 and the hand wheel 194, which is placed at the front of the machine. Mechanism is provided for engagingand disehgaging the crown wheels 146, 148,- 150, 180 and 182 so that the shaft 140 may be turned by hand or may driven slowly by power to feed'the work or may be rapidly driven by power for the return feed after the bucket is i cut.

mechanism comprises two levers 200 and- 202 which are pivoted to the machine frame at 204 and 206 "respectively and which bear pins engaging peripheral slots in the crown wheels [46 and 180 respectively. A rod 208.

connects the lower end of the lever 200 to a bell crank lever 210 on which is formed the handle 212. When the handle 212 is raised, .the splined-crown wheel 146 is thrown into mesh with thecrown wheel 148 and the work 'is slowly fed forward by power. When the handle 212-is depressed, the crown wheel 148is brought into mesh with the crown wheel 150 and the work is iven a quick power driven return stroke min the feed. 2 When the handle 212 isin intermediate po- 'sition, as illustrated in Fig. 2, the crown "50 wheel 146 is not meshed with either of the power. driven crown wheels 148 or'150. A

- connection is provided between the rod 208' and the crown wheel 180 so that when the 'handle 2-12'is in intermediate position, the I crown wheel 180 will mesh with the crown wh'eeL- 182, but when the handle 212 is thrown up or down the crown wheel 180 will not mesh with 'the crown wheel 182.

his connection comprises a link 220 pivotally-connected at 222 and 224 to the rod.

' 208 and the lever 202 respectively. The link 220 has a projecting arm 226 which is arranged to contact with the rod 208 when.

the rod is moved to the right as viewed in Fig.2, and "a :pin 228 which is arranged to depression of the handle 212, the arm 226 is brought into contact with the rod 208 so hold the crown wheel 180 in mesh with Q recessor bucket250 whichis inclined to the which is rectangular in outline and forms the end'wall of 'the mouth portion 262 of the 136 Contact with the link 220 when the rod is moved to the left. When .the rod .208, is

,movedto the left by the raising of the handl'e 212 the link 220' is'brou-ght against the pi11-228 which acts as'a pivot for the link and through the lever 202 slides the sp'lihed-f crown wheel 180 out ofengagement with the teeth of'the crown wheel 182. When the rod 208 is moved to the right by the and serves to move the link 220 bodily to the right and through the lever 202 slides the crown wheel 180 out of engagement with the crown wheel 182-. When the rod 208 is in intermediate position,- as illustrated in Fig. 2, the arm 226 and pin-228 act to hold the link 220 in the position illustrated and the crown wheel 182.

The operation of the machine is as follows: The turbine wheel 60 is clamped in place on the turret 66 and the handles 124 and 194 are turned to properly present the rim 62 of the. wheel to the milling cutter. The handle 2:12 is then thrown up to feed the work to the milling "cutter 1. After the first bucket is milled, the, handle 102 is turned "to position the work for the milling of the neat bucket and so on until a series of 5 buckets like those shown at 250 on' Fig. 3

1 are cut out. Since the end faces 2 and 3 of the mil-ling cutter are flat, the bucket as milled during the first operation has a semi cylindrical bottom portion having its flat we end walls parallel to each other so that the partitions 252 are thicker near their edges than at the bottom of the bucket. As clearly shown Figs. 3 and 5, the cutter 1 mills a.

1105 surface of the work and in which the face- 3 of thecuttei' sinks up to the axis of the cutter and in which the face 2 of the cutter sinks beyond the axis of the cutter. The bucket 250 has "a bottom portion 260 "which is undercut beneath the partition 252 and a mouth portion 262"which lies to the left, as viewed in Fig. 5, of the edge of the overhanging partition 252. The bottom portion 260 is semi-cylindrical in shape. The

.c'urved side wall 264 of the bottom portion is a concave semi-cylindrical surface. The

end wall 266-ofthe bucket which is next the. end face 3 of the cutter is a complete semicircular sector. The end wall 2680f the bucket which is next-theend' face 2 of the cutter ,may .be considered as divided into two parts, namely, the part 270, which lies beneath the partition 252 and which is. a complete semi-circular sector forming the end wall of the bottom portion 260, and the part 272 which lies, as viewed in Fig. 3, to the left of the-edge of the partition 252-and riphery of theturbine wheel-60 at a slightly 6 either from the end bucket 'and terminates in a semi-circular partat the bottom portion of the bucket.

' 5 The sides 27 of the mouth portion 262 are parallel and triangular in outline and form continuations ofthe curved side wall 264: of the bottoni'portion of the bucket. To mill the partitions 252 to a uniform thickness the support is adjusted topresent the pedifierent angle to the milling'cutter, as illustrated in Fig. 5. The cutter .1 then acts to mill 011' one side of the partitions "252 so that 15 they are of the same thickness near their "edges as at the bottom of the buckets, as shown at the right -hand side of the work illustrated in Fig. 5 and the fiat end walls of the buckets "are slightlydi'vergent. Then 20 after. 'the above described milling opera tionslare completed, the edges of the lips 252 are filed down to a comparatively sharp edge and the buckets are carefully smoothed so that the buckets on the completed wheelv are'like those'shown in Fig. 8 of the drawing s. As illustrated in Figs. 7 8 and,9, the

completed buckets 350 resemble the bucke s- 2 50 cutb'y the first .millin'g' operation except that their end walls 366 and 370 are slightly divergent. The/.completed buckets have a mouth portion 362. bounded'on' either side by parallel triangular side walls 374 and having. a rectangular. end wall 372. Each bucket/terminates in a bottom portion 360 35 which is undercut beneath the partition-252 and. which constitutesan open-mouthed substantially semi-cylindrical cavity. Since the edge of the partition 252 is straight and unbroken, the two flat and slightly divergent end walls 366 and 370 of the bottom port-ion 360 form complete and unbroken semi-circular sectors. The ,side wall 364 of the bottom portion 360- is an unbroken concave semi-cylindrical surface which is continued beyond the edge of the partition 252 to form the triangular side Walls 374 of the mouth portion of the bucket. The length of the bucket 250, or the. space betweenthe end walls 266 and268 which the cutter can occupy, is determinedby the-length of the cutter teeth imeasured axially of the cutter.- Therefore, in order that the cutter may jsink into the work, as illustrated in Fig. 3, it is' necessary that one .end face of the cutter must-be free, for a complete semi-circular sector, of projections which would extend, either from the end face of the cutter itself, or from the wall.20 of the notch 18 in the stud 6, beyond a plane which is normal to the axis of the cutter and which-passes through the corners of the cutter teeth, and

that the other end face of the cutter must for more than a semi-circular sec- 'which would extend, face of the cutter itself .be free,

tor, of -,proj.ect1ons 1,os1,24e

' tion,

the cutter. It is obvious, however, that his the milling cutter is intended to define a embodied within the spirit of the invention having, in combination, a circular millin or from the head 8 of the stud 6, beyond a plane. which, like the first plane, is normal to the axis of the cutter and which passes through the other corners of the cutter teeth. In the illustrated embodiment of the inveni the two end faces 2 and '3 of the cutter are flat and the wall 20 of the notch 18 and the endof the stud head 8 are flat surfaces flush respectively with the faces 3 and 2 of not necessary that the faces 2and 3 of'the cutter, or'the wall20 of the notch 18, orthe end of the studhead 8 be flat surfaces =50 long as they are free of projections which would extend axially of the cutter beyond the cutter teeth. Therefore, the expression 1 free of projections 'as employed in the specification and claims with reference to construction in which there are no ,proj ections extending either from thecutter itself, or from the journal upon which thecutter is mounted, axially of the cutter beyond the cutter teeth. Iii machining the wheel 60,

eitherv before or after the. bucketsare formed, the middle of the p ri he of the I rim is turned down so'thata slightprojelct ing flange 280 is formed on either side of the. line of buckets.

- The present invention is not limited to the details of construction of the preferred form of thetjnventiori above specifically jillustrated and described, but maybe otherwise as set forth in the following claims.

I v-; v f- 1. A machine for millin turbine buckets,

having,in combination, a circular millin center, a stud forminga. supporting journa for the cutter a'nd'having its side next the work cut away adjacent the cutter to permit the. cutter to mill a bucket having-its'bottom'j portion forming a substantially semi-cylindrical cavity with unbroken substantially semi-circularend walls, 'a work. support, and means for causing a relative feeding move ment between the work and the cut" substantially as described. l

, 2. A-ma'chin'e for milling' turbine buckets,

cutter, a stud forming a supporting. j ourna for-the cutter-and having its side next the work cutaway adjacent the cutter to permit I the cutter to mill a bucket having'its bottom. portion forminga substantially. senii-cylin- 120 drical cavity with unbroken substantially V semi-circular'end walls,- means'engaging the cutter onthe side opposite thejwork for driving the cutter, a work .support, and means for causing a relativefeeding movement between the work and the milling cuts ter, substantially as described.

3. A.machm ..f mining turbme bucketshaving, in. combination, a circular toothed milling cutter, a forming a supporting 13.0

iio

journal 61 the cutter and having its side next the work cut away adjacent the cutter to permit the'cut-ter to mill a bucket having its bottom portion forming a substantially semi-cylindrical ,cavity with unbroken substantially' semi-circular end walls, a power I driven rotary member meshing with the teeth of the cutter on the side opposite the work f r driving the cutter, a work support,

and me us for causing a relative feeding movement between the work and the milling cutter, substantially as described.

4. Aqnachine for milling turbine buckets,

' having, in combination, a circular milling cutter having a countersunk bearing, a headed stud forming a supporting journal for the cutter, having its head received 1n the countersink to leave one face of the cutter entirely free of projections and having its side next the work adjacent the other face of tlie cutter cut away to'leave the secend face of the cutter entirely free of pronotch being substantially flush with the side. of the cutter to leave said face of the cutter 40- jections for a complete semicircular sector next the work, means for driving the cutter, a work support, and means for causing a relative feeding movement between the work and the milling cutter, substantially as described. v

' 5. A machine for milling turbine buckets, having, in combination, a. circular milling cutter having a countersunk bearing, a headed stud formingv asupporting journal for the cutter, having its head received in the countersink flush with one face of the cutter,

to leave said face entirely free of projections and having a notch out in its side adjacent the other face of the cutter, one face of the free .of projections for a substantially com-- .plete semi-circular sector. next the work, whereby the cutter is permitted to cut a bucket inclined to the surface of the work and having its-bottom portion forming a substantially semi-cylindrical cavity with unbroken substantially semi-circular" end walls, means engaging the cutter on the side opposite the work for driving the cutter, a

work support, and means for causing a relative feeding movement between "the work and the milling Icutter, substantially as described. v

6. A machine for milling turbine buckets,

'having, in combination, a circular milling cutter having its teeth forminggear teeth, a power driven member meshing with the .olltter teethfordriving the cutter and a journal for the cutter projecting beyond one end face only of the cutter, as described.

7. A machine for milling turbine buckets, having, iii combination,- a circular milling substantially cutter, and means,'for supporting and drivmg the cutter leaving one end face of the cutter free of projections for a substantially complete;semi-circularsector next to the work and leavingtheother end face of the cutter free from projections for more than a semi-circular sector next .the work, substantially as described. a I I 8. A machine for milling turbine buckets, having, in combination, a circular milling cutter having one side of its teeth shaped to form worm gear teeth and a worm meshing r with the teeth of the milling cutter for driving the cutter, substantially as described.

9. A machine for millingturbine buckets, having,'in combination, a circular milling cutter having its cuttingteeth also forming the teeth of a gear, a stud forming a supporting journal for the cutter having its side next the work cut away adjacent the. cutter to permit the cutter to mill a bucket having its bottom portion forming a sub stantially semi-cylindrical cavity with unbroken substantially semi-circular end walls,

a power driven member engaging the teeth of the cutter on the side opposite the work for driving the cutter, a work support, and means forcausing a relative fe'edinginov'ement between the work and the milling cut- 7 ter,"substantially asdescribed. v 10.- A machine for milling turbine buck ets, having, in combination, a circular milling cutter alsohaving its teeth forming the teeth of a worm gear, a stud forming a supporting journal for the cutter having its side next the work cut away adjacent the cutter to permit the cutter to mill a bucket having its bottom portion forming a substantially semi-cylindrical cavity with unbroken substantially semi-circular end walls, a worm engaging the teeth of the cutter on the side opposite the work for driving the cutter, a work support, and means for causing" a relative feeding movement between gthe work and the milling cutter, substantially as described. a

11. machine for millingturbinelbuckets, having, in combination, a circular milling journal for the cutter having its head received in the countersink to leave one face of the cutter entirely free of projections and having its side between its axis and the work 1 cut away adjacent the other face of the cutter to leave the other face of the cutter entirely free of projections for a su tanthe work, a supporting sleeve in which the "stud is received having its end face next the. 1 cutter forming a bearing surface to cotiper-. ate with the stud head to hold the cutter and having its side next the work cut away 126 to. form a notch coincident with the ,c ut away portion of the stud, means engaging a the cutter on the side opposite the work for driving the cutter, ;a work support, and

ing cutter, a headed stud forming a supportl tially complete semi-circular sector next meansfor causing a r iv n i g, o e 1 I Correction? letters Patent No. 1,081,242,

I merit-between the tel-kind the cutter substantially as described.

{2. A maehine fol; milling turbine buckets,-'haing,. combination, a, circular-min cutter; and means for supportimgand the cutter including a. journal upon the cutter is mounted to rotate and which is so cut away next the work that one end face of the cutter is free of projections for a substantially complete semicirculareector next the work and the other end-face of the cutter is free from projeetioneior than a. semi-eiroular sector next to- I the work, so that the zeutter may mill an.

inelined bucket in the w'orkinto which the cutter may sin]; euhstentiallyjo it noqgm printed sfieeification reqniring eori-eetion'ne follows:

as described.

- 13. A machine ets, having, in combination, a milling cutter, means for driving the cutter, and a supfor turbine buck v at one (Hid of the cutter and beyond its axis at the other end of theaeutter, substantially port for presenting the cutter in position to mill an inclined bucket, said support having a notch fol; receiving the wedge-shaped portion of the-work between the inclined v bucket being' milled and the surface of the work,-substanti'ally as described;

JOHN F. LYONS. I

Witnesses:

- B. 'M. Cnl'rncx, W. L. SABGEA T;

' Q It is hereby oertified that f Patent No 21,081,242Jgranted Deeeinher 9, 1913, upon the application-of John QF. Ly ns, of HydeP-a rk, MassaehueettsQfor an impro eu ent in Meehinee fen Milling Tui'bine Buoketefiun error appears in the menses read gutter; and thin the 55m Lette r s Petent'should'b'e read' with this eorreetiontherein -that the snme' 'inayj eon form to rthe record ofltheoese in the igneand sealed this sunn ,bf Jainuary A,- 11, 14. 7

' 3L mwmm l gge 4,: line I'Qhfor the woi'd i of Pate "tel I Correction? letters Patent No. 1,081,242,

I merit-between the tel-kind the cutter substantially as described.

{2. A maehine fol; milling turbine buckets,-'haing,. combination, a, circular-min cutter; and means for supportimgand the cutter including a. journal upon the cutter is mounted to rotate and which is so cut away next the work that one end face of the cutter is free of projections for a substantially complete semicirculareector next the work and the other end-face of the cutter is free from projeetioneior than a. semi-eiroular sector next to- I the work, so that the zeutter may mill an.

inelined bucket in the w'orkinto which the cutter may sin]; euhstentiallyjo it noqgm printed sfieeification reqniring eori-eetion'ne follows:

as described.

- 13. A machine ets, having, in combination, a milling cutter, means for driving the cutter, and a supfor turbine buck v at one (Hid of the cutter and beyond its axis at the other end of theaeutter, substantially port for presenting the cutter in position to mill an inclined bucket, said support having a notch fol; receiving the wedge-shaped portion of the-work between the inclined v bucket being' milled and the surface of the work,-substanti'ally as described;

JOHN F. LYONS. I

Witnesses:

- B. 'M. Cnl'rncx,

W. L. SABGEA T;

' Q It is hereby oertified that f Patent No 21,081,242Jgranted Deeeinher 9, 1913, upon the application-of John QF. Ly ns, of HydeP-a rk, MassaehueettsQfor an impro eu ent in Meehinee fen Milling Tui'bine Buoketefiun error appears in the menses read gutter; and thin the 55m Lette r s Petent'should'b'e read' with this eorreetiontherein -that the snme' 'inayj eon form to rthe record ofltheoese in the igneand sealed this sunn ,bf Jainuary A,- 11, 14. 7

' 3L mwmm l gge 4,: line I'Qhfor the woi'd i of Pate "tel 

